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Neutral in Biological Definition

Evolution

... that are phylogenetically distant. For example, neutral human DNA sequences are approximately 1.2% ... without which evolution cannot proceed. neutral mutations do not affect the organism's chances ... are not affected by natural selection are called neutral mutations . Their frequency in the population is ...

Molecular evolution

... 2.3 Molecular study of phylogeny 2.4 The neutral theory 2.5 Infinite alleles model 2.6 ... (or beneficial ) ones tend to accumulate. neutral mutations do not affect the organism's chances ... sequencing of around 1000 base pairs . The neutral theory Main article: ...

Neutral theory of molecular evolution

... The neutral theory of molecular evolution (also, simply the neutral theory of evolution ) is an influential theory ... A second assertion or hypothesis of the neutral theory is that most evolutionary change is the ...

Isozyme

... a long way from the active site then the mutation may be selectively neutral and subject to genetic drift . (3) In rare cases the mutation may ... are usually subtle (particularly between allozymes which are often neutral variants ). This subtlety is to be expected, because two enzymes that ...

Alcohol

... to the left) Nucleophilic substitution The OH group is not a good leaving group for nucleophilic substitution reactions, so neutral alcohols do not react in such reactions. However if the oxygen is first protonated to give R−OH 2 + , the leaving group ( water ) is much ...

Biodiversity

... of the recorded species, with 47,000 plants species and 81,000 animals. See also : biogeography , Amazonian forest , extinction , Unified neutral theory of biodiversity . Is biodiversity threatened? During the last decades, erosion of biodiversity has been increasingly observed. The ...

Cladistics

... for the character "presence of wings", a homeoplasy would be introduced into the dataset, and it might cause erroneous results. In practice, neutral features like exact ultrastructure (a term for extremely fine structure, microscopic or molecular composition of cellular structure) may be used to ...

Ewens's sampling formula

... m is just what the formula above would give if m were put in place of n . References Warren Ewens, "The sampling theory of selectively neutral alleles", Theoretical Population Biology , volume 3, pages 87—112, 1972. J.F.C. Kingman, "Random partitions in population genetics", ...

Extinction

... species See also Coextinction List of extinct animals The Skeptical Environmentalist Biodiversity Unified neutral theory of biodiversity Population genetics External links A mathematical model for mass extinction Species disappearing at an ...
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